Assignment:
An executive placement service needs to estimate the average salary of executives placed in a given industry. A random sample of 40 executives gives x = $42,539 and s = $11,690. Give a 90% confidence interval for the average salary of an executive placed in this industry.
Your answer must be typed, double-spaced, Times New Roman font (size 12), one-inch margins on all sides, APA format and also include references.